Assistant Underwriter, UK & Ireland Casualty (London)

Job Title: Assistant Underwriter, UK & Ireland Casualty

Entity: Rokstone Underwriting

Department: Underwriting

Location: London/Hybrid

Who We Are

Rokstone, part of the Aventum Group, is an established international underwriting MGA and approved Lloyd’s of London coverholder, where we also hold a Lloyd’s Box. With innovation at our core, we go beyond the ordinary to offer brokers specialised (re)insurance solutions. Within Rokstone, we house specialist MGAs such as Novus, iSure, and iFarm, each contributing to our commitment to redefining industry standards.

Our people are at the heart of Aventum. Working together in dynamic, service-focused teams, we prioritise our customers in everything we do. Collaboration fuels our success, courage drives innovation, and continuous improvement keeps us ahead in a rapidly evolving industry. Our shared commitment is to revolutionise insurance for the better, one day at a time.

We also believe that investing in our people is investing in our future. By empowering people across the Group to develop their careers, advance within the Group, and embrace new challenges, we build an environment where growth and learning never stop.

Our competitive benefits package, offered via a flexible benefits platform, reflects this. Beyond core benefits, employees can tailor their benefits to meet their needs and support their unique goals and ambitions.

Role Summary

Rokstone Underwriting is seeking a motivated Assistant Casualty Underwriter to join our UK & Ireland team. This role will focus on supporting a portfolio of third-party liability risks, including Employers’, Public, and Products Liability, with additional exposure to Professional Indemnity and other casualty lines.

You will work closely with the Underwriting team, brokers and internal stakeholders to support technical underwriting decisions, develop business opportunities, and support profitable growth across the UK and Ireland casualty portfolio.

Role Accountabilities

• Support underwriters in evaluating new business and renewals in casualty classes, including EL, PL, and Products Liability.
• Perform risk analysis and assist in pricing and structuring coverage in line with underwriting guidelines.
• Draft and review policy documentation, endorsements, and quote presentations.
• Liaise directly with brokers to request information and clarify underwriting queries.
• Maintain underwriting and system records accurately and consistently.
• Monitor portfolio data, assist with reporting, and support ongoing audit or compliance requirements.
• Contribute to internal projects, product development, and continuous process improvements.
• Begin to build an understanding of underwriting appetite and make initial underwriting assessments within pre-agreed referral levels.

Role Requirements

• Strong organisational skills with the ability to manage multiple priorities.
• Good analytical skills and attention to detail.
• Confident communicator with a professional, proactive approach to internal and external interactions.
• Sound working knowledge of Microsoft Excel and insurance systems; exposure to underwriting platforms is advantageous.
• Enthusiastic about developing a career in underwriting and progressing toward increased responsibility.
• Working toward Cert CII or higher qualification is strongly encouraged

We are an equal opportunity employer, and we are proud to share that 93% of our employees say they can be themselves at work. We aim to hire our industry's finest people because the best people drive the best outcomes. We will forever challenge the status quo because we know there are always ways to improve things. Because together, we're limitless.

We value applicants from all backgrounds and foster a culture of inclusivity. We understand the need for flexibility, so we work in a hybrid model. Please let us know if you require any reasonable adjustments during the recruitment process.